EP2338854B1 - Procédé de purge de tubes à durcissement par UV - Google Patents

Procédé de purge de tubes à durcissement par UV Download PDF

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Publication number
EP2338854B1
EP2338854B1 EP10153990.6A EP10153990A EP2338854B1 EP 2338854 B1 EP2338854 B1 EP 2338854B1 EP 10153990 A EP10153990 A EP 10153990A EP 2338854 B1 EP2338854 B1 EP 2338854B1
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EP
European Patent Office
Prior art keywords
cure
gas
optical fiber
tube
oxygen
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Active
Application number
EP10153990.6A
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German (de)
English (en)
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EP2338854A1 (fr
Inventor
Peter Haslov
Kariofilis Konstadinidis
Harry Garner
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OFS Fitel LLC
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OFS Fitel LLC
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Publication of EP2338854A1 publication Critical patent/EP2338854A1/fr
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    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C25/00—Surface treatment of fibres or filaments made from glass, minerals or slags
    • C03C25/62—Surface treatment of fibres or filaments made from glass, minerals or slags by application of electric or wave energy; by particle radiation or ion implantation
    • C03C25/6206—Electromagnetic waves
    • C03C25/6226—Ultraviolet
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/06—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to radiation
    • B05D3/061—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to radiation using U.V.
    • B05D3/065—After-treatment
    • B05D3/066—After-treatment involving also the use of a gas
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/06—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to radiation
    • B05D3/061—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to radiation using U.V.
    • B05D3/065—After-treatment
    • B05D3/067—Curing or cross-linking the coating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B13/00—Machines and apparatus for drying fabrics, fibres, yarns, or other materials in long lengths, with progressive movement
    • F26B13/001—Drying and oxidising yarns, ribbons or the like
    • F26B13/002—Drying coated, e.g. enamelled, varnished, wires
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/14—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects using gases or vapours other than air or steam, e.g. inert gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B3/00—Drying solid materials or objects by processes involving the application of heat
    • F26B3/28—Drying solid materials or objects by processes involving the application of heat by radiation, e.g. from the sun
    • F26B3/283—Drying solid materials or objects by processes involving the application of heat by radiation, e.g. from the sun in combination with convection
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2203/00—Other substrates
    • B05D2203/30—Other inorganic substrates, e.g. ceramics, silicon
    • B05D2203/35—Glass
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2256/00—Wires or fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/04—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to gases
    • B05D3/0466—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to gases the gas being a non-reacting gas

Definitions

  • This invention generally relates to ultraviolet (UV) curing, and more particularly, to purging UV curing tubes.
  • UV radiation curable materials are used extensively in the production of optical fiber, particularly in the production of protective coatings that surround the optical fiber.
  • One class of radiation curable materials can be converted from a liquid to a solid upon exposure to light energy in the ultraviolet (UV) spectrum, e.g., wavelengths ranging from about 200 to about 400 nanometers.
  • Most UV radiation curable materials contain a monomer and oligomer mixture with an added photo-initiator package that facilitates cross-linking upon exposure to the radiation. The extent of the cross-linking reaction is dependent upon the amount of exposure to the radiation.
  • the coatings surrounding an optical fiber can be quickly cured by drawing the coated optical fiber past a high power UV curing lamp at a speed proportional to the radiation density provided by the curing lamp.
  • atmospheric oxygen can react with certain coating materials to form peroxy radicals that can interfere with the curing process and may cause incomplete curing, particularly at the surface of the coating where the oxygen is present. Therefore, when a high degree of cure is required on the secondary or exterior coating layer, the coated fiber may be cured in an inert environment.
  • the coated fiber can be drawn through a center tube filled with inert gas (such as nitrogen) to maintain an oxygen-free atmosphere while the coating is cured.
  • the center tube is usually made of UV transparent quartz to allow UV light to pass from the curing lamp to the fiber coatings with minimal attenuation, absorption, or scattering of the light.
  • temperatures within the UV curing tube can often reach or exceed 90 degrees Celsius due to the heat produced by the UV lamps, even with high flow rates of nitrogen.
  • the elevated temperature can cause a portion of the uncured coating material to volatize (or off-gas) and, unfortunately, the volatiles can form deposits on the inner surface of the center tube.
  • These coating deposits can cause significant clouding on the inner surface of the center tube and can severely attenuate the UV curing light to the point where the fiber coatings may not be sufficiently cured. Therefore, the center tubes are routinely replaced on a regular basis, often with each new preform.
  • EP 1 088 638 A2 discloses an apparatus and a method for curing a coated optical fiber by drawing the coated fiber through a nitrogen filled gas chamber and a cure tube.
  • EP 1 004 362 A1 discloses a method of applying an ultraviolet-curing resin to a linear body and passing the linear body through an ultraviolet-transmitting tube.
  • US 5 171 609 discloses an inert ultraviolet light reaction chamber provided with a flow of liquid on its light transmitting wall surface to prevent the build up of light blocking deposits, control the temperature and filter out undesired portions of the spectrum.
  • JP 2005 224689 discloses further methods for curing coated optical fibres.
  • Certain embodiments of the invention may include methods for purging UV curing tubes.
  • the invention provides a method for curing a coated optical fiber.
  • the method includes drawing the coated optical fiber through a gas chamber filled with an inert gas, drawing the fiber through a cure tube coupled to the gas chamber, purging at least a portion of an inner surface of the cure tube with a purge gas comprising oxygen as the coated optical fiber is drawn through the cure tube while at least a portion of the coated optical fiber is surrounded and in contact with the inert gas, and exposing the coated optical fiber to radiation.
  • Certain embodiments of the invention may enable purging of UV cure tubes (also known as center tubes) while curing optical fiber coatings.
  • a purge gas comprising oxygen may be used to selectively purge at least a portion of the inner surface of a cure tube in order to reduce the build-up of deposits on the cure tube while maintaining an inert environment around the optical fiber during cure. Accordingly, the reduction or removal of deposits from the cure tube may allow more radiation from a UV lamp, for example, to reach the optical fiber coatings for a more complete and efficient cure of the coatings.
  • purging the cure tube may extend the time that the cure tube may be used in a curing oven before it is removed and replaced due to excessive build-up of light attenuating deposits.
  • a predetermined gas such as nitrogen, helium, argon, etc.
  • a predetermined gas comprising an insignificant amount of oxygen
  • the optical fiber coatings may include dyes or pigments for coloring and identification purposes.
  • the optical fiber coatings may include slickness additives or release agents to modify the surface properties of the cured coatings.
  • Example release agents may include silicone acrylates, silicone oils, fluorocarbons, fluorocarbon oils, or fluorocarbon acrylates.
  • the colored optical fiber may be utilized in ribbon fiber where, for example, multiple colored fibers may be surrounded by a matrix material that can enclose and protect the multiple fibers, but may peel back to expose the individual fibers without tenaciously adhering to the coatings on the individual colored fibers.
  • the cure tube purging may enable increased control and precision in the radiation dose that reaches the optical fiber coatings, and therefore, may allow optimum curing in colorless or colored coatings, with or without a slickness additive. Therefore, according to example embodiments of the invention, the properties of the optical fiber coatings can be controlled with increased curing precision.
  • the purging of the cure tube is achieved by introducing a purge gas comprising oxygen into the cure tube through an input orifice separate from the inert gas input orifice.
  • a purge gas comprising oxygen
  • the inert gas may effectively envelop the coated optical fiber during cure while the purge gas may effectively scrub the inner surface of the cure tube.
  • the oxygen in the purge gas may bind with the carbon to produce carbon dioxide that can be carried away in the inert and purge gas mixture.
  • the inert and purge gasses may be selectively directed so that the uncured coating on the fiber is substantially surrounded by inert gas during the cure, and the purge gas may be directed to the inner surface of the cure tube while substantially surrounding the inert gas during the cure.
  • the inert and purge gasses can mix in the downstream regions of the cure tube, preferably after the fiber coatings have been sufficiently cured.
  • non-oxygen methods for example, nitrogen and/or ammonia glow discharge plasmas may be utilized to remove carbon build-up from an inner surface of the cure tube.
  • FIG. 1 illustrates an example cure tube purging system 100.
  • a coated optical fiber 102 that may be drawn through a gas chamber 104.
  • the gas chamber 104 may be filled with a predetermined gas such as an inert gas or noble gas.
  • Example predetermined gasses may include nitrogen, helium, and argon.
  • the gas chamber 104 may be coupled to a cure tube 106.
  • the predetermined gas 108 may enter the gas chamber 104 via an inert gas delivery input bore or hose 110.
  • the predetermined gas 108 may flow into the gas chamber 104 and comprise an inert gas upstream flow 116 (towards the coated optical fiber 102 coating mechanism, for example), and an inert gas downstream flow 118 (towards the curing oven, for example) to effectively keep oxygen from contacting the uncured fiber coating.
  • purge gas 112 may be introduced into the cure tube 106 via a purge gas delivery input 114.
  • the purge gas 112 may be preferentially directed via a purge gas inlet 120 towards the inner surface of the cure tube 106 so that the purge gas 112 may reduce surface contamination 126 build-up on the cure tube 106.
  • the predetermined gas 108 may effectively envelop the coated optical fiber 102 in the curing region 130 to buffer the uncured coating from the purge gas 112, as depicted by the inert/purge flow approximate boundary 122.
  • curing light from a radiation source 124 may penetrate the cure tube 106 and cure the optical fiber coating in the curing region 130. After sufficient curing, the cured optical fiber 128 may then be exposed to oxygen.
  • the predetermined gas 108 and the purge gas 112 may freely mix in the downstream portion of the cure tube 106.
  • the purge gas 112 may comprise about 0.5% to about 21% oxygen, and the ratio of oxygen to inert gas in the cure tube may be at least 1:1000.
  • the cure tube 106 may comprise quartz glass or other suitable materials that are substantially transparent to the light produced by the radiation source 124.
  • FIG. 2 depicts an example UV transmission graph 200 that illustrates the general effects of purging the cure tube 106 with a purge gas 112 comprising oxygen.
  • the abscissa (x-coordinate) of the graph is time 204 (arbitrary units), and the ordinate (or y-coordinate) is percentage 202 (arbitrary units).
  • the example UV transmission graph 200 includes three curves: an inert gas curve 206, 214 (upper dashed curve), a UV transmission curve 210, 218 (solid line curve), and an oxygen curve 208, 216 (bottom dashed curve).
  • the cure tube contains 100% inert gas 206 and 0% oxygen 208.
  • purging the cure tube with a purge gas comprising oxygen 216 can slow, or stop, or even reverse the build-up of deposits from the cure tube. Therefore, the oxygen purging can help increase the curing efficiency by reducing or eliminating deposit build-ups in the cure tube that attenuate the curing light.
  • a coated optical fiber may be drawn through a gas chamber filled with a predetermined gas.
  • the predetermined gas may include, for example, nitrogen, argon, helium, or any other suitable inert gas having negligible amounts of oxygen.
  • the fiber may be drawn through a cure tube coupled to the inert gas chamber.
  • at least portion of an inner surface of the cure tube may be purged with a purge gas as the coated optical fiber is drawn through the cure tube.
  • the coated optical fiber may be exposed to radiation.
  • the radiation for example, may comprise UV light.
  • the flow rates of the predetermined gas 108 and the purge gas 112 may be controlled individually and/or collectively to produce the desired deposit reduction, and/or curing results for a number of cure tube purging system 100 configurations and coating formulations. Shown in Table 1 below are example measurement results for two different coating formulations (coating #1 and coating #2) at various flow rates and oxygen concentrations. For coating #1, Table 1 indicates that an oxygen concentration of 0.51% in the purge gas (upper wall) results in good coating cure results, and even this small concentration of oxygen in the purge gas is sufficient to keep the cure tube from clouding, at least for a particular configuration and overall flow rate.
  • Table 1 indicates that a certain amount of clouding in the cure tube may occur when the purge gas comprised only 2.25% oxygen (upper wall). However, increasing the oxygen in the purge gas to 4.10% may be sufficient to keep the cure tube from clouding.
  • the example values listed in Table 1 are illustrative inert gas and purge gas flow rates that may produce desired results in certain embodiments of the invention.
  • different designs of the cure tube purging system 100 e.g., systems with different cure tube diameters, fiber draw speeds, etc.
  • the flow rates of the inert gas and the purge gas may be set to promote laminar flow of the purge gas against the inner surface of the cure tube, and to minimize turbulent flow of the gasses. By minimizing turbulent flow, the purge and inert gasses may not prematurely mix and expose the uncured coating to oxygen before the fiber coating surface is cured.
  • example embodiments of the invention can provide the technical effects of creating certain systems and methods that can reduce and/or remove deposits from the cure tube.
  • the systems and methods may increase curing efficiencies by allowing more radiation from a UV lamp, for example, to reach the optical fiber coatings for a more complete cure of the coatings.
  • purging the cure tube may extend the time that the cure tube may be used in a curing oven before it must be removed and replaced due to excessive build-up of light attenuating deposits.
  • embodiments of the invention may include the cure tube purging system 100 with more or less of the components illustrated in FIG 1 .
  • the invention is described above with reference to the block and flow diagrams of systems, methods, and apparatuses, according to example embodiments of the invention. Some blocks of the flow diagram may not necessarily need to be performed in the order presented, or may not necessarily need to be performed at all, according to some embodiments of the invention.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Plasma & Fusion (AREA)
  • Textile Engineering (AREA)
  • Electromagnetism (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Microbiology (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Surface Treatment Of Glass Fibres Or Filaments (AREA)
  • Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)

Claims (6)

  1. Procédé pour durcir une fibre optique revêtue (102), le procédé étant caractérisé par le fait de:
    tirer la fibre optique revêtue (102) à travers une chambre à gaz (104) remplie d'un gaz inerte (108);
    tirer la fibre (102) à travers un tube de durcissement (106) couplé à la chambre à gaz (104);
    purger au moins une partie d'une surface intérieure du tube de durcissement (106) à l'aide d'un gaz de purge (112) comprenant de l'oxygène au fur et à mesure que la fibre optique revêtue est tirée à travers le tube de durcissement (106) tandis qu'au moins une partie de la fibre optique revêtue (102) est entourée par et en contact avec le gaz inerte (108); et
    exposer la fibre optique revêtue (102) à un rayonnement.
  2. Procédé selon la revendication 1, dans lequel la purge est caractérisée par le fait d'exposer au moins une partie d'une surface intérieure du tube de durcissement (106) uniquement au gaz de purge (112), dans lequel le gaz inerte (108) et le gaz de purge (112) sont séparés par un flux laminaire.
  3. Procédé selon la revendication 1, caractérisé par ailleurs par le fait de diriger au moins une partie du gaz inerte (108) de la chambre à gaz (104) vers le tube de durcissement (106) pour protéger la fibre optique revêtue (102) contre le gaz de purge (112) pendant le durcissement.
  4. Procédé selon la revendication 1, dans lequel le gaz de purge (112) comporte de l'oxygène, et le rapport entre l'oxygène et le gaz inerte (108) dans le tube de durcissement (106) est d'au moins 1:1000.
  5. Procédé selon la revendication 1, dans lequel le tube de durcissement (106) est purgé à l'aide d'un gaz de purge (112) comportant d'environ 0,5 pour cent à environ 21% pour cent d'oxygène.
  6. Procédé selon la revendication 1, caractérisé par ailleurs par le fait de diriger le gaz inerte (108) vers la chambre à gaz (104), dans lequel le gaz inerte (108) comprend environ 100 pour cent d'azote, d'hélium ou d'argon, ou un mélange de ces derniers.
EP10153990.6A 2009-12-24 2010-02-18 Procédé de purge de tubes à durcissement par UV Active EP2338854B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US12/647,053 US8637115B2 (en) 2009-12-24 2009-12-24 Systems and methods for purging UV curing tubes

Publications (2)

Publication Number Publication Date
EP2338854A1 EP2338854A1 (fr) 2011-06-29
EP2338854B1 true EP2338854B1 (fr) 2021-05-05

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EP10153990.6A Active EP2338854B1 (fr) 2009-12-24 2010-02-18 Procédé de purge de tubes à durcissement par UV

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US (1) US8637115B2 (fr)
EP (1) EP2338854B1 (fr)
CN (1) CN102108012B (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016100144A1 (de) * 2016-01-05 2017-07-06 J-Fiber Gmbh Vorrichtung zum Beschichten einer Faser sowie Verfahren zum Beschichten einer Faser und Faser
SG11201804316UA (en) * 2016-05-24 2018-06-28 Tkx Corp Device for manufacturing coated wire
CN109721258A (zh) * 2019-02-28 2019-05-07 武汉理工大学 一种在光纤表面定点涂覆的方法和装置

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005224689A (ja) * 2004-02-12 2005-08-25 Sumitomo Electric Ind Ltd 被覆線条体の製造方法及び紫外線照射装置

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US5171609A (en) * 1990-12-04 1992-12-15 Fusion Systems Corp. Fiber curing with fluid flow
US5418369A (en) * 1993-03-12 1995-05-23 At&T Corp. System for continuously monitoring curing energy levels within a curing unit
FR2729152A1 (fr) * 1995-01-06 1996-07-12 Alcatel Cable Dispositif de reticulation par rayonnement uv
CN1099917C (zh) * 1998-06-19 2003-01-29 住友电气工业株式会社 固化紫外线固化树脂的方法和设备
US6325981B1 (en) 1999-09-28 2001-12-04 Alcatel Apparatus and method for curing a photocurable coating provided on a fiber
JP2003095704A (ja) 2001-09-21 2003-04-03 Hitachi Cable Ltd 光ファイバの製造方法
JP2003119045A (ja) * 2001-10-12 2003-04-23 Furukawa Electric Co Ltd:The 光ファイバの線引き方法
JP2009294254A (ja) 2008-06-02 2009-12-17 Fujikura Ltd 光ファイバ素線の製造方法および製造装置

Patent Citations (1)

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Publication number Priority date Publication date Assignee Title
JP2005224689A (ja) * 2004-02-12 2005-08-25 Sumitomo Electric Ind Ltd 被覆線条体の製造方法及び紫外線照射装置

Also Published As

Publication number Publication date
CN102108012B (zh) 2015-09-02
US8637115B2 (en) 2014-01-28
CN102108012A (zh) 2011-06-29
EP2338854A1 (fr) 2011-06-29
US20110159178A1 (en) 2011-06-30

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